Pyrenacantha Hook.

Rio, Cédric Del, Stull, Gregory W. & Franceschi, Dario De, 2020, Survey of the fruits and endocarps of Icacinaceae (Lamiids, Icacinales), European Journal of Taxonomy 645, pp. 1-130 : 69

Genus Pyrenacantha Hook.

Figs 23.10–23.27, 24–30, 31.1–31.9

Description

FRUIT. Elliptical to globose, apex accrescent elongate, sometimes widely inflated, laterally compressed or not, yellow to black when mature. Epicarp puberulent to pilose, with simple hairs, small ovoid hairs with an acuminate apex, long and thin hairs, or uncinate hairs, yellow, occasionally red or white; occasionally shriveled when dry, revealing the underlying reticulum of endocarp ridges. Calyx absent or persistent, often separated from the fruit by more or less extended gynophore.

ENDOCARP.Brown to cream, elliptical-ovoid to globose, rarely deltoid in lateral view, lenticular to globose in transverse section. Keel, more or less visible, surrounding the endocarp in the plane of symmetry. Apex asymmetrical in lateral view; base symmetrical. Outer surface of the endocarp pitted and ridged, with the ridges delimiting a reticulate pattern, which in general surrounds the pits. Sometimes the ridges are not visible except at the apex. Pits more or less circular, in longitudinal lines or randomly distributed, each pit associated with a tubercle protruding into the locule; tubercles spiny, peg-shaped, cylindrical, or elongate-flattened. Vasculature of the endocarp free; primary vascular bundle positioned outside the endocarp wall. Endocarp wall mainly with three stratified cell layers. Locule surface often with regularly spaced and rounded to large papillae, occasionally only present at the apex of the tubercles, smooth in some cases, not clearly lacunate.